# Two point source

## Homework Statement

Two point sources, S1 and S2, are vibrating in phase and produce waves with a wavelength of 2.5 m. The two waves overlap at a nodal point. Calculate the smallest corresponding difference in path length for this point.

## The Attempt at a Solution

I really don't know how to start this question. How can I find the length when I am only given the wavelength

What relevant equations do you think you would need?

What relevant equations do you think you would need?
sinθn= (n-1/2) (λ/d) , honestly I really don't understand what this question is asking

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Do you know what sources are, nodal points and the paths from the sources to the point on the nodal line?

Do you know what sources are, nodal points and the paths from the sources to the point on the nodal line?
yes

There is a relationship which shows that the length of a line from a point on nodal line n, to source 1 and the length of another line from the same point on nodal line n, to source 2, when subtracted have a value dependent on the wavelength of the sources. Do you remember learning about path length difference?